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aluminum wire sizes

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The aluminum conductor size for a 400 amp service entrance is double runs of 4/0 awg. This size can carry up to 400 amps,which is the 400 amp capacity. A common misconception is that 4/0 size wire can be used in place of 250 due to its ease of installation. The maximum current carrying capability for 4/0 is 185 amps,while 250 can carry 215 amps.

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